Carex tangii

Taxonomy

• Kingdom: Plantae
• Clade: Tracheophytes
• Clade: Angiosperms
• Clade: Monocots
• Clade: Commelinids
• Order: Poales
• Family: Cyperaceae (Sedge family)
• Genus: Carex L.
• Species: Carex tangii S.Y.Liang
• Botanical Authority: S.Y.Liang, described in 1999.

Etymology

The specific epithet "tangii" is a botanical dedication, likely honoring a botanist, collector, or individual named Tang, a common practice in scientific nomenclature to commemorate those who have contributed to the field.

Description

Carex tangii is a perennial herbaceous plant belonging to the large and diverse genus of sedges (Carex). It typically grows in loose tufts (caespitose).

• Culms (Stems): The flowering stems are erect, obtusely trigonous (three-angled with rounded edges), smooth, and generally reach a height of 40–70 cm.
• Leaves: The basal leaves are shorter than the culms, linear in shape, and typically 2–3 mm wide.
• Inflorescence: The reproductive structure is an inflorescence composed of 3–5 spikes.
  • Terminal Spike: This spike is usually male (staminate), linear-cylindric in form, and measures approximately 3–4 cm in length.
  • Lateral Spikes: These spikes are female (pistillate), narrowly cylindric, 2–5 cm long and 5–8 mm wide. They are densely flowered and often borne on a distinct peduncle (stalk) that is 2–3 cm long.
• Perigynia: Characteristic of Carex, the female flowers are enclosed within a sac-like structure called a perigynium. For C. tangii, these are ovoid-ellipsoid, trigonous, 2–2.5 mm long, membranous, smooth, and terminate in a short beak.
• Achenes: The fruits are achenes, typically trigonous, enclosed within the perigynia.

Distribution and Habitat

Carex tangii is endemic to China, with its known distribution restricted to Sichuan Province. It typically thrives in mountainous regions, where it can be found growing in forests, along forest margins, or on grassy slopes. Its specific altitudinal preferences are associated with montane environments.

Conservation Status

Specific conservation status information for Carex tangii, such as an assessment by the IUCN Red List, is not widely available. As a species with a relatively restricted geographical range and recent description, detailed population studies or threats analyses may be limited. However, like many narrowly endemic species, its populations could potentially be vulnerable to habitat degradation, climate change, or other environmental disturbances within its specific habitat.